The North Face Summit Series Pro 120 ($90) is a lightweight synthetic base layer designed for high-output days in cool-to-mild conditions. Its stretchy, perforated grid fabric excels at wicking moisture and drying quickly, while still offering a touch of warmth. It’s also impressively durable, and the latest version now includes an odor-resistant treatment—a welcome upgrade. The skin-tight fit won’t appeal to everyone, and it’s not the best choice for frigid temps, but for those who prioritize breathability above all else, the Pro 120 is a standout option.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
Fabric(s)
100% polyester
Fabric weight
120 g/m²
Weight
5.4 oz.
Variations
None
Pros
Cons
The North Face Summit Series Pro 120
For this season's top models, see our guide to the Best Base Layers.
With its 132 grams per square meter (g/m²) polyester fabric, The North Face Summit Series Pro 120 delivers lightweight warmth best suited for spring conditions and mild summer days in the mountains. Its skin-tight fit creates a cocoon-like effect that traps heat, making it warmer than its ultralight build suggests—noticeably more insulating than the Outdoor Research Echo Hoodie and Patagonia Capilene Thermal Weight (129 g/m²). And because the Pro 120 is so thin, it puts no limits on your layering system—you could even layer a warmer, looser base layer on top (like the Smartwool Classic Thermal). While I wouldn’t necessarily recommend that combo (overheating seems inevitable), it does illustrate just how versatile this TNF layer can be.
I wore The North Face Summit Series Pro 120 skiing in-bounds on a 35-degree day, paired with my Arc’teryx Atom LT and Patagonia Storm Shift shell, and the system worked perfectly. As the day heated up, the base layer impressed me by wicking moisture efficiently and preventing sweat from clinging to my skin. One of Better Trail’s editors swears by the Pro 120 for high-output skate-ski sessions in mild winter temperatures. She also used it on a multi-day traverse of the North Cascades in early summer, often as a standalone piece. All told, the Pro 120 has proven itself comfortable across a wide range of temperatures and conditions, capable of managing heat and sweat without compromising warmth. In the same scenarios, a merino layer would likely have overheated and grown heavy with moisture.
Breathability is baked into the design of The North Face Summit Series Pro 120, and it’s among the most breathable base layers I’ve tested. The DotKnit fabric features an internal grid structure with engineered holes that accelerate airflow and moisture transfer, and its thin, skin-tight construction feels almost like a second skin. While a base layer like the Outdoor Research Echo may edge it out in terms of pure airflow, it can’t match the added warmth that the Pro 120 provides.
I first tested the Pro 120 on a mild spring resort day, booting uphill to access sidecountry terrain. Despite generating plenty of body heat, the base layer effectively dumped warmth and never felt swampy under my ski jacket. That experience convinced me that it would be ideal for spring backcountry missions, such as skiing Mt. St. Helens or Mt. Baker. Another Better Trail editor even calls it her most breathable base layer, and in a white colorway, would even consider wearing it in place of a sun hoody.
The North Face Summit Series Pro 120 has proven itself impressively durable, especially for such a lightweight, skin-tight layer. One of Better Trail’s editors wore it for a week straight on a traverse of the North Cascades—often as a standalone piece—and it came away without a single hole. There are a few fabric snags, and the seams have become fuzzy in high-use areas, such as the cuffs, arms, and where a hipbelt rubbed. However, overall performance was exceptional. By contrast, merino layers of a similar weight would almost certainly show thinning fabric and holes after the same use.
The North Face Summit Series Pro 120 is a mixed bag when it comes to comfort. On the plus side, the fabric is buttery soft inside and out, with none of the plasticky or rough texture often found in synthetics. It’s also decently stretchy, and with the help of Merrow stitching, it can feel like a true second skin.
Where the Pro 120 fell short for me was in the fit: it’s extremely slim and borders on restrictive in the arms and chest. For skiing, I found it a little too claustrophobic to be enjoyable. That said, if you like a body-hugging, always-there feel, you may find the Pro 120 to be very comfortable—it just comes down to personal preference.
The version of the North Face Summit Series Pro 120 I tested didn’t include any odor-resistant treatment, and it showed—after a couple of uses, the fabric developed a lingering stink that never fully washed out and flared up again as soon as I started sweating. Thankfully, the updated version of the Pro 120 now comes with an anti-odor treatment, which should make a big difference in long-term wearability.
That said, synthetics will always lag behind merino in this category. If odor resistance is your top priority for multi-day backpacking trips or travel without access to laundry, a merino base layer is still the gold standard. But if you want the breathability, quick-drying performance, and durability of the Pro 120, the treated version strikes a much better balance. For a deeper dive into the two common base layer materials, read our article Merino Wool vs. Synthetic Base Layers.
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Longevity
Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.
Recycled Materials
Recycled materials are prevalent in outdoor gear, with nylon, polyester, wool, and down among the most common, but the composition varies widely. A green check mark indicates the product is made with a substantial amount of recycled materials (100% recycled or the core fabric that makes up most of the product is recycled), a yellow check means it contains a moderate to small amount of recycled materials, while a red X means there are no recycled materials in the product.
Bluesign Approved
Bluesign Technologies, based in Switzerland, operates a third-party textile management system that ensures materials are manufactured to strict environmental, chemical, and worker safety standards. A green check mark indicates a product is either a Bluesign Product (contains at least 90% Bluesign-approved fabrics and 20-30% Bluesign-approved accessories) or features a significant amount of Bluesign-approved materials. A yellow check mark means it uses some Bluesign-approved materials but less than the aforementioned category, and a red X means there are no Bluesign-approved materials in the product.
Responsible Manufacturing
This criterion evaluates a brand’s commitment to fair wages, safe working conditions, and reducing environmental impact through certifications and programs like Fair Trade Certified, Fair Wear Foundation, Worldwide Responsible Accredited Production (WRAP), and the Fair Labor Association, while also recognizing brands that manufacture primarily in the U.S. or Europe under strict labor and environmental regulations. A green check mark indicates a brand meets our responsible manufacturing criteria, while a red X means it does not.
Recycled and/or Reduced Packaging
Packaging can add significant waste to outdoor gear purchases, so many brands work to reduce its impact by using recycled materials, incorporating Forest Stewardship Council-certified paper products, and minimizing plastic and paper use. A green check mark indicates a brand uses recycled or reduced materials across all of its packaging, a yellow check indicates moderate or limited use of recycled or reduced packaging, and a red X indicates the brand does not make either of these efforts.
Resale and/or Recycling Services
Resale and recycling programs help keep outdoor gear in circulation longer and out of landfills, ranging from trade-in resale platforms that offer store credit to take-back initiatives that recycle products at the end of their usable life. A green check mark indicates a brand offers both resale and recycling programs, a yellow check mark indicates it offers one or the two, and a red X indicates it offers neither.
Carbon Footprint Tracking
This criterion evaluates whether a brand measures, reports, and works to reduce its greenhouse gas emissions using established frameworks such as the Higg Index, Greenhouse Gas Protocol, or The Change Climate Project. A green check mark indicates a brand publicly reports greenhouse gas emissions data, sets clearly defined reduction targets, and uses established tracking frameworks such as Higg or The Change Climate Project. A yellow check mark indicates the brand tracks emissions and outlines reduction goals but provides limited data, lacks science-based verification, or does not clearly report progress. A red X indicates the brand does not appear to track greenhouse gas emissions or provides so little information that its efforts cannot be verified.
Annual Impact Report
Annual impact reports provide transparency and accountability by outlining a brand’s sustainability efforts across areas such as material sourcing, greenhouse gas emissions, waste, water use, supply chains, and packaging. A green check mark indicates a brand publishes a detailed, brand-specific impact report that closely aligns with our sustainability criteria and leaves little room for ambiguity. A yellow check indicates a brand provides some relevant sustainability reporting but lacks detail in key areas or is covered only briefly within a parent company report. A red X indicates a brand does not regularly publish an impact report.
Tester: 5’6” 140 lb.; 37" chest; 32" waist
Size tested: Women’s medium
Wow—this is a slim fit. I usually wear a small or medium in women’s clothing, and this medium felt nearly too small. It’s particularly tight in the chest, so if you’re busty or have broader/more muscular shoulders, I’d recommend sizing up. The sleeves are also a bit on the short side, though the thumbholes do a great job of keeping them in place and preventing them from riding up.
Outdoor Research Echo Hoodie ($75): Free-Flowing and Versatile
If you’re in search of a lightweight base layer, also consider the Outdoor Research Echo. For $15 less, the Echo is more versatile with a free-flowing fit and hood, which allows it to double as a sun hoody. Given this design, we’re much more likely to wear the Echo as a standalone piece. On the other hand, it barely offers any warmth, while the Summit Pro 120’s DotKnit fabric is insulating and cozy in mild conditions.
Arc’teryx Rho Crew Neck ($100): Turn Up the Thermometer
If the Pro 120 sounds appealing but you need more warmth for winter, the Arc’teryx Rho is the natural step up. Built with 190-gram polyester and a cozy microfleece lining, it provides significantly more insulation. And like the Pro 120, it features stretchy Merrow seams and has an impressively durable face fabric that effectively resists abrasion. Accounting for its extra warmth, the Rho can’t quite match the Pro 120’s breathability or airy feel, but for mid-winter skate skiing or cold-weather layering, however, it’s one of our top synthetic picks. For more, read our Arc'teryx Rho review.
A wonderful option for high-output activities, the Summit Pro 120 is lightweight, breathable, and quick-drying. It also offers significant warmth for its thin construction, making it versatile for a range of temperatures and activity levels. However, not everyone will love the skin-tight fit.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
A lightweight and airy base layer that doubles as a sun hoody, the Echo is a great next-to-skin layer for activities that prioritize breathability and moisture management above warmth. But it’s not as soft as merino, and the material is prone to snagging and pilling.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
A smooth exterior, brushed fleece interior, and highly stretchy design make the Rho more comfortable than most synthetic base layers. It also excels in wicking moisture away from the skin and dries quickly. However, the cozy fleece is hot in mild conditions.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
The North Face Summit Series Pro 120 is best for high-output adventurers who want a lightweight yet durable base layer that thrives in cool-to-mild conditions. It shines for ski touring, spring resort days, early summer mountain missions, or any activity where breathability and fast dry times matter more than insulation.
Go for it if you want a lightweight base layer that excels at managing heat and sweat build-up while still providing a bit of warmth.
Pass on it you need winter-ready warmth or prefer a looser-fitting base layer.
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